//===============================================================================
// This file is based on the Microsoft Data Access Application Block for .NET
// For more information please go to 
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp
//===============================================================================

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
using System.Text;

namespace Tools
{

    /// <summary>
    /// The SqlHelper class is intended to encapsulate high performance, 
    /// scalable best practices for common uses of SqlClient.
    /// </summary>
    public abstract class SqlHelper
    {
        public static string WpConnectString = ConfigurationManager.ConnectionStrings["WpConnectString"].ToString();
        //Database connection strings
        // Hashtable to store cached parameters
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            int val = 0;
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                conn.Close();
            }
            return val;
        }

        /// <summary>
        /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>A SqlDataReader containing the results</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            // we use a try/catch here because if the method throws an exception we want to 
            // close the connection throw code, because no datareader will exist, hence the 
            // commandBehaviour.CloseConnection will not work
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }

        /// <summary>
        /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>A DataTable containing the results</returns>
        public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            DataTable dt = new DataTable();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(dt);
                da.Dispose();
                cmd.Parameters.Clear();
                conn.Close();
            }
            return dt;
        }

        public static DataTable ExecuteDataTableByCache(string connectionString, CommandType cmdType, string cmdText, string CacheKey, params SqlParameter[] commandParameters)
        {
            DataTable dt = new DataTable();
            object cachedObject = CachingHelper.GetCacheObject(CacheKey);
            if (cachedObject != null)
            {
                dt = (DataTable)cachedObject;
            }
            else
            {
                using (SqlConnection conn = new SqlConnection(connectionString))
                {
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    da.Fill(dt);
                    CachingHelper.SetSqlCacheDataTable(CacheKey, dt, cmd); // Save Cache DataTable to CacheKey
                    da.Dispose();
                    cmd.Parameters.Clear();
                    conn.Close();
                }
            }

            return dt;
        }

        /// <summary>
        /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataTable dt = ExecuteDataTable(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>A DataTable containing the results</returns>
        public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            DataSet ds = new DataSet();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                da.Dispose();
                cmd.Parameters.Clear();
                conn.Close();
            }
            return ds;
        }

        /// <summary>
        /// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            object val;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
            }
            return val;
        }

        /// <summary>
        /// add parameter array to the cache
        /// </summary>
        /// <param name="cacheKey">Key to the parameter cache</param>
        /// <param name="cmdParms">an array of SqlParamters to be cached</param>
        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        /// <summary>
        /// Retrieve cached parameters
        /// </summary>
        /// <param name="cacheKey">key used to lookup parameters</param>
        /// <returns>Cached SqlParamters array</returns>
        public static SqlParameter[] GetCachedParameters(string cacheKey)
        {
            SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];

            if (cachedParms == null)
                return null;

            SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

            for (int i = 0, j = cachedParms.Length; i < j; i++)
                clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

            return clonedParms;
        }

        /// <summary>
        /// Prepare a command for execution
        /// </summary>
        /// <param name="cmd">SqlCommand object</param>
        /// <param name="conn">SqlConnection object</param>
        /// <param name="trans">SqlTransaction object</param>
        /// <param name="cmdType">Cmd type e.g. stored procedure or text</param>
        /// <param name="cmdText">Command text, e.g. Select * from Products</param>
        /// <param name="cmdParms">SqlParameters to use in the command</param>
        public static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }



        ///// <param name="ConnectionString"></param>

        ///// <returns></returns>

        //public static string GetDatabaseName(string ConnectionString)
        //{

        //    Regex2 _Regex2 = new Regex2();

        //    string pattern = @"DATABASE=([^\;]+);";

        //    string dbName = _Regex2.GetTextByRegex(pattern, ConnectionString, true, 0, 1);

        //    return dbName+".dbo.";

        //}

        //public static string SubString(string strBody, int iSize)
        //{
        //    strBody = MP.Tools.UnicodeConversion.CreateInstant().GetTextFromHtml(strBody);
        //    if (strBody.Length > iSize)
        //        return strBody.Substring(0, iSize) + " ...";
        //    return strBody;
        //}
        /// <param name="TableName">Ten table</param>
        /// <param name="Whereclause">Deu kien khoa ngoai,ngoai deu dien OldIndex va NewIndex: vd: Whereclause:And CategoryId='C72A89DC-7D29-49AF-81A1-6D646BA65010'</param>
        /// <param name="Whereclause1">Deu kien xat dinh record hien tai: vd: Whereclause: Id='C72A89DC-7D29-49AF-81A1-6D646BA65010'</param>
        /// /// <param name="Whereclause2">Deu kien nguoc voi dk Whereclause2: vd: Whereclause2: And Id<>'C72A89DC-7D29-49AF-81A1-6D646BA65010'</param>
        /// <param name="OldIndex"></param>
        /// <param name="NewIndex"></param>
        public static void UpdateOrders(string TableName, string WhereClause, string Whereclause1, string WhereClause2, int NewIndex)
        {
            int MaxRecode = 100;
            StringBuilder str = new StringBuilder();
            str.AppendLine("DECLARE @NewIndex INT");
            str.AppendLine("DECLARE @MaxOrder INT");//DisplayOrder Max so voi dieu kien Whereclause1
            str.AppendLine("DECLARE @OldIndex INT");//Vi tri cu the deu kien Whereclause
            //Xac dinh Max so voi dieu kien Whereclause1
            //str.AppendLine("SELECT @MaxOrder = ISNULL(MAX(DisplayOrder),0) FROM " + TableName + " WHERE DisplayOrder <>" + MaxRecode + WhereClause + WhereClause2);
            //Xac dinh vi tri cu so voi dieu kien Whereclause1
            str.AppendLine("SELECT @OldIndex = DisplayOrder FROM " + TableName + " WHERE " + Whereclause1);

            str.AppendLine("IF(@OldIndex > " + (MaxRecode - 1) + ")");
            str.AppendLine("SET @OldIndex=" + MaxRecode);

            str.AppendLine(" IF(@OldIndex>" + NewIndex + ")");
            str.AppendLine(" UPDATE  " + TableName + " SET DisplayOrder = DisplayOrder+1 ");
            str.AppendLine(" WHERE DisplayOrder>=" + NewIndex + " AND DisplayOrder < @OldIndex " + WhereClause);

            str.AppendLine(" ELSE    ");
            str.AppendLine(" BEGIN    ");
            str.AppendLine(" IF(" + NewIndex + ">" + (MaxRecode - 1) + ")    ");
            str.AppendLine("    UPDATE  " + TableName + " SET DisplayOrder = DisplayOrder-1    ");
            str.AppendLine("    WHERE DisplayOrder > @OldIndex AND DisplayOrder <= " + (MaxRecode - 1) + WhereClause);
            str.AppendLine(" ELSE");
            str.AppendLine("    UPDATE  " + TableName + " SET DisplayOrder = DisplayOrder-1    ");
            str.AppendLine("    WHERE DisplayOrder > @OldIndex AND DisplayOrder<=" + NewIndex + " " + WhereClause);
            str.AppendLine(" END");

            str.AppendLine("SELECT @MaxOrder = ISNULL(MAX(DisplayOrder),0) FROM " + TableName + " WHERE DisplayOrder <>" + MaxRecode + WhereClause + WhereClause2);
            str.AppendLine(" IF(" + NewIndex + ">@MaxOrder) ");
            //str.AppendLine("    SET @NewIndex=@MaxOrder+1");
            str.AppendLine(" UPDATE " + TableName + " SET DisplayOrder =(@MaxOrder+1)");
            str.AppendLine(" WHERE " + Whereclause1);
            str.AppendLine(" ELSE ");
            str.AppendLine(" UPDATE " + TableName + " SET DisplayOrder =" + NewIndex);
            str.AppendLine(" WHERE " + Whereclause1);
            using (SqlConnection conn = new SqlConnection(WpConnectString))
            {
                conn.Open();
                SqlCommand sqlCmd = new SqlCommand { CommandType = System.Data.CommandType.Text, CommandText = str.ToString(), Connection = conn };
                sqlCmd.ExecuteNonQuery();
            }
        }

    }
}
